The phrase "allowed the observer to" is correct and usable in written English.
It can be used when describing a situation where someone or something grants permission or enables an observer to do something.
Example: "The new technology allowed the observer to gather data more efficiently during the experiment."
Alternatives: "permitted the observer to" or "enabled the observer to".
On the other was a 19-year-old barman in a white T-shirt who allowed the Observer to observe the confidential process but asked not to be named.
A trained nurse (JK) accompanied SC during the 14 observations that were conducted in districts 1 and 2. The semi-structured nature of the observation guide allowed the observer to 'look for' pre-defined elements of care as well as other events or behaviour that may arise during the observation.
In the week when tanks have again been dispatched by Moscow to another country, Babi has allowed The Observer to publish his snapshots of that time, including a ghostly image of his comrades in a pine forest and one of himself standing next to his lorry.
A colourless Plexiglas tunnel with a system of shutters, attached to each nest entrance, allowed the observer to control the movements of bees into and out of the colony.
The presence of different 'tabs' allowed the observer to see the tasks that were being scored at the current time.
Use of surface plot enhanced images enabled greater definition of the two-dimensional image, which allowed the observer to discard false-positives prior to analysis.
The images were loaded in allocated workflows for either std-SPECT/CT or UF-SPECT/CT; this method allowed the observers to individually adjust the brightness and contrast settings of the images and fusion of the images if desired.
The team sat individual chimpanzees down to watch several of their peers drop toy balls into a series of boxes to receive treats, then allowed the observers to do the same.
Goals are considered to be important for action observation since they allow the observer to copy the goal of the action without the need to use the exact same means.
This way, the model becomes a spatio-temporal representation of the unique painting process, allowing the observer to experience the time-space of the watercolor painting.
Finally, the images used did not allow the observer to take into account the size of the fish, while the size of the species can influence their attractiveness4.
