| 摘要 |
Many instruments have been employed for indicating different phenomena by mechanical means, as in a clock wherein time is conventionally designated by the movement of hands over time representing digits arranged circumferentially in an endless, circular array, or by means of a rotary drum bearing similar indicia in endless formation. Instruments of this sort are sometimes difficult to read, especially in the dark. The present invention involves a system for transforming the intelligence thus displayed into one wherein a moving spot of light is made to move linearly along a finite scale having a discrete beginning and a discrete end, thereby facilitating the recognition of the involved phenomena at a glance.
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