US436153A - Arthur bergh satterlee - Google Patents

Description

(No Model.)

A. B. SATTERLEE.

SUN DIAL.

Patented Sept. 9, 1890. i:

A TTORNEY.

UNITED STATES PATENT OFFICE.

ARTHUR BERGH SATTERLEE, OF NEVV" YORK, N. Y.

SUN-

DIAL.

SPECIFICATION formng part of Letters Patent No. 436,153, dated September 9,1890.

Application filed January 25, 1890. Serial No. 338,152. (No model.)

To all whom it may concel'n:

Be it known that I, ARTHUR BERGH SAT- TERLEE, a citizen of the United States, residngin the city, county, and State of New York, have invented a new and useful Improvement in Sun-Dials, of which the following is a specification.

My invention relates to an improvement in sun-dials, the object of the same being to pro- Vide a device for telling the time by the sun. A further object is to provide a device of the above character which will be simple and economic-al in construction and durable and efficient in use; and with these ends in view my invention consists in the certain features of construction and combinations of parts, as Will be hereinafter fully described, and pointed out in the claim.

In the accompanying drawings, Figures 1 and 2 represent the two semicircles, each made with an isosceles triangle attached forming the style and having the angles `A D O equal to t-he latitude of the place in which it is intended that the sun-dial shall be sold. Fig. 3 shows the bottom plate with two lines intersecting in the center of the circle. Fig. 4 is the box with the top thereon, showing the bar secured to the top and the dial suspended therefrom.

Any known formula may be used to determine the correct hour and minute lines. The formula employed in this instance may be found in Trautwi'ncis Engineers Pocket- Boolc, series of 1883, under the head of Dialing, pages 150, 151.

In the drawings, the lines A A represent the true north and south lines, the east and west lines being designated by the letters E and l/V. The dial, as shown, is intended to designate hours, half-hours, and quarterhours.

The bottom plate (shown in Fig. 3) having two lines a intersecting in the center of the circle, is so arranged that the angle at which the lines are drawn is equal to the magnetic Variation of the place in which the dial is to be used.

The style b is formed in two sections, the triangular portions c of each being bent at right angles t-o the face of the dial. The parts c are pasted together, so that the style will form a complete circle. The upper end of the triangle is provided with the circle d, formed directly in the center thereof and of the dial, so that the lines will coincidethroughout. A needle 8 is inserted between vthe two sections of the style forming the top, so that the point will be in the center of the circle d and directly on the east and west line, the prolongation of which is on the style.

The bottom plate (shown in Fig'. 3) has two lines intersecting in the center of the circle. The angle at which these lines are drawn is equal to the magnetic Variation of the place in which the dial is to be used. This plate is pasted on the dial, so that one of the lines will be on a line with the style as the Variation of the magnetic needle may be east or west.

The angles a' c' f and D' c' c' are equal to the magnetic Variation. Suppose the angle a' e' is on line with the style. The compassneedle H is pasted on the line f' D', thus making the correction for magnetic Variation. The dip of the needle is corrected by sliding the needle backward or forward on the line f' D' before the mucilage has hardened. The finishing-plate h is then paste'd over the bottom plate and the needle.

The dial complete is inclosed in a round pasteboard box. The top of the box has a line j 70 drawn through the center of the circle. The top of the box is provided with the perforation l in the side thereof to receive the brass piece m, which enters therein at one end of the line j 70 and upon 'which is suspended the dial, as shown in Fig. 4.

I-Iaving descrbed the construction of the dial, I will describe the operation thereof. The dial should be placed in the direct rays of the sun with the top on the box. The bar m is then inserted in the perforation Z with the needle-point of the dial resting thereon. When steady, the east and west line on the dialA should be nearly parallel 'with the bar. When the dial is quiet, the time may be read by the shadow. p

v I-Iaving fully described my invention, what I claim as new, and desire to secure 'by Letters Patent, is-

IOO

In testimony whereof I have aflixed my signature in presence of two Wltnesses.

ARTHUR BERGH SATTERLEE.

Vitnesses:

THOMAS F. MURRAY, LONTINE L. N. SATTERLEE.

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