Chinese English

A PROJECTION of the cylindrical type, being in principle equivalent to the regular MERCATOR PROJEC­TION turned (transversed) 90° in AZIMUTH. In this PROJEC­TION, the CENTRAL MERIDIAN is represented by a straight line, corresponding to the line which represents the EQUATOR on the regular MERCA­TOR PROJECTION. Neither the GEOGRAPHICAL MERIDI­ANS, except the CENTRAL MERIDIAN, nor the GEODETIC PARAL­LELS, except the EQUATOR (if shown), are repre­sented by straight lines. It is a CONFORMAL PROJEC­TION. Also called transverse cylindrical orthomorphic projection.

An optical instrument which throws the IMAGE of a NEGATIVE or PRINT upon a SCREEN or other viewing surface, usually at a larger scale. An underwater acoustic TRANSMITTER. See UNDERWATER SOUND PROJECTOR.

能够将负片或像片的影像通常以更大比例显示投射在屏幕或其他可视表面上的光学仪器。 一种水下声波发射器。参见underwater sound projector（水下发声换能器）。

In PHOTOGRAMMETRY, an instrument by means of which the IMAGE of an AERIAL PHOTOGRAPH can be projected onto a MAP. By varying the position of the projector lens, the scale of the projected IMAGE can be varied, and, by tilting the table top, compensation can be made for any tilt in the PHOTO­GRAPH.

摄影测量中，可将航摄像片的影像投影到地图上的仪器。通过变换投影器透镜的位置，可以改变所投影影像的比例，通过倾斜台面可校正像片的斜度。

In CARTOGRAPHY, an advanced copy of a MAP produ­ced to check the design, register and/or to enable ERRORS to be detected and corrected before final prin­ting.

An advanced copy of a map or chart produced by a PLOTTER to check the design and registration, and to detect and correct errors before final printing.

由绘图机生产的一种为了在最后印刷之前便于审定图案、套合并查找和改正误差，由绘图机生产的地图或海图印样。

An instrument consisting in its simple form of two legs pointed at both ends and provi­ded with an adjustable PIVOT, so that for any given pivot setting, the distance between one set of pointed ends always bears the same ratio to the di­stance bet­ween the other set. A change in the PIVOT changes the ratio. The dividers are used in transfer­ring measure­ments between CHARTS or other drawings which are not at the same SCALE.

一种仪器，具有指向两个终端的两条腿似的简单形状，由一个可调节的枢纽调节其张距，这样当枢轴在任意特定的位置时，两张距之间的距离总是具有相同比率。变化枢轴即改变了比率。该比例规用于在不同比例尺的海图或其他图幅间进行转绘或量距。

An instrument for measuring angles on a surface; an angular SCALE. In its most usual form it consists of a circle or part of one (usually a semi­circle) graduated in DEGREES. See PROTRACTOR: THREE ARM and COMPASS ROSE.

一种用于在某一表面上测量角度的仪器；分度规。其最普通的形状为一个刻有度数的圆盘或圆盘的一部分（通常为半圆盘）。参见three arm protractor（三臂分度器）和compass rose（方位圈）。

Square or rectangular sheet of trans­parent xylonite engraved with a circle graduated in DEGREES and half DEGREES. Observed angles are drawn, in general, on the under side. See PROTRACTOR: THREE ARM.

An instrument consisting essentially of a PROTRACTOR and one or more arms attached to a parallel motion device, so that the movement of the arms is everywhere parallel. The protractor can be rotated and set at any position so that it can be oriented to a CHART. Also called univer­sal drafting machine.