US1520245A - Periscope with a transparent hood - Google Patents

Description

Dec. 23, 1924.

J. HUMBRECHT PERISCOPE WITH A TRANSPARENT HOOD Filed Alli. 23. 1921 Inventor Patented Dec. 23, 1924.

YUNITED STATES 1,520,245 PATENT CFFICE.

JULES HUMBRECHT. 0F FRIEDENAU, NEAR BERLIN. GERMANY, ASSIGNOR T0 THE" FIRM OF OPTISCHE ANSTALT C. P. GOERZ AKTIENGESELLSCHAFT, 0F FRIEDENAU,

GERMANY.

Application filed August 23, 1921.

PERISCOPE WITH A. TRANSPARENT HOOD.

Serial No. 494,498.

(GRANTED UNDER THE PROVISIGNS 0F lTHE ACT 0F MARCH 3, 1921, 41 STAT. L., 1313.)

To all w/iofm. t may concern:

Be it known that I, JULES HUMBRECi-rr, a citizen of the German Republic, and resident of Friedenau, near Berlin, Germany,

have invented certain new and useful Improvements in and Relating to Periscopes with Transparent lloods (for which I have filed applications for patent in Germany December 2l, 191.5; Hungary June 4, 1917, and Austria December i3, 191.7), of which the following is a specification.

This invention relates to a periscope particularly for submarines provided with a light entrance reflector adapted to rotate about an axis substantially transverse to the longitudinal main casing of the instrument so as to allow observation ot' objects under variable elevation such as air-crafts. The invention relates more particularly to such instruments of this kind which are provided with a transparent hood for closing the instrument easing at the light entrance end and with a lens movable with the entrance reflector for compensating the light ray distorting the effect oi. the transparent hood of the instrument.

The invention consists in an improved instrument of the kind referred to allowing convenient observation ot objects ot varying elevation, wherein for securing this effect a coupling between the rotatable entrancereflector and the correcting lens movable therewith is provided of such kind that the correcting lens is rotated with double the angular velocity of the entrance reflector. Such kind of coupling between the entrance reflector and the correcting lens yhas the effect that the parts are permanently in operative position with relation to each other irrespective the elevation under which the observation takes place.

.An embodiment ot' the invention is illustrated on `the annexed drawing and de- `scribed in the following specification with reference to the drawing.

Fig. .1 shows the instrument in axial section partly in side elevation.

Fig, VL is an axial section through the upper .part of the instrument showing the rotatable entrance reflector and the correcting lens in a position different from that shown in Fig. l.

The transparent hood of the instrument v coupled with at the light entrance end is designated l. Centrally to this globular hood is arranged the light entrance reflector which in the embodiment illustrated on the drawing consists of two right angled triangular prisms 2, 3 which are cemented together. The contact surface 4 of the prisms has the function of a surface refiecting on both its sides. In Jr'ront of the entrance reflector 4 is arranged as already proposed a corrcctii'ig lens 5 which compensates the lens effect of the globular hood 1. rl`he correcting lens 5 is the entrance reflector 4. For this purpose the reflector 4 is connected with a toothed wheel 6 and the correcting lens 5 with a. topthed wheel 7, the said two wheels meshing with toothed racks 8 and 9 respectively, said toothed racks being provided on a common carrier 1() connected to a rod ll which is adapted to be moved by the observer.

l2 designates the objective system; 13 is a transparent plate arranged in the image plane of the objective and provided with suitable marks.y let and l5 designate the two elements oi an image reversing system and 1G an angular ocular.

The path of a pencil of rays indicated in the drawings shows that a special construction ot' the rotatable reflector with which the instrument is provided aflords the possibility that even in the zenith position of the reflector shown in Fig. 2 light rays are reflected trom the double sided reflector 4 so as to impinge on the objective 12 and to form an image of the object in zenith position viewed at by the instrument.

What I claim is:

l. In a periscope with a transparent hood closing thc light entrance end Vof the instrument in combination an entrance reflector and a lens in front oi' the entrance refiector adapted to compensate the lens el'ect of the hood both rotatable about a common axis substantially at right angles to the axis ot' the periscope, gearing adapted to sinniltaneousl)Y rotate said lens and said entrancereflector the angular velocity communicated by said gearing to said lens being double the velocity communicated to said entrance reflector.

2. In a periscope with a transparent hood closing the light entrance end of the instrument. in combination au entrance reflector and a lens in front of the. entrance relector adapted to compensate. the lens effect of the hood both rotatable about a common axis substantially at right angles to the axis of the periscope, gearing adapted to simultaneouslyT rotate said lens and said entrance reiector the latter being formed of a compound prism having two symmetric halves with one adjacent. reflector surface forming-adouble sided operative entrance reflector for the instrument said compound prism having an angular velocity communicated to it by said gearingr halt that of said lens. a

3. In a periscope with a transparent hood closing the light entrance end of the instrument in combination a compound prism of square cross section consisting. of two right angled triangular. prisms with cementedv specification in the prese-nce of two subscribing witnesses.

f Witnesses: a

e HERMANN REISING,

JOHANN-Rowena; l

JULES runvnssaucrrrgf, e

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